Development of Inverse Vibration Technique for Damage Detection of Offshore Jacket-type Platforms, Ph.D. Dissertation Sharif University of Technology ; Golafshani, Ali akbar (Supervisor) ; Mohtasham Dolatshahi, Kiarash (Supervisor)
Abstract
In this dissertation a new approach is introduced for damage detection in offshore jacket platforms. The procedure uses the measured ambient vibration responses and the corresponding readable natural frequencies and mode shapes of the structural systems. Since offshore platforms are composed of heavy topsides supported by jacket structures, participation of the first mode is dominant in each direction in the response of the structure under field excitations. Moreover, ambient vibrations such as wave loads and boat impacts only excite the first modes of the structure. Therefore, it is difficult to find higher modes and the pertinent frequencies by use of accelerometers data. The introduced...
Cataloging briefDevelopment of Inverse Vibration Technique for Damage Detection of Offshore Jacket-type Platforms, Ph.D. Dissertation Sharif University of Technology ; Golafshani, Ali akbar (Supervisor) ; Mohtasham Dolatshahi, Kiarash (Supervisor)
Abstract
In this dissertation a new approach is introduced for damage detection in offshore jacket platforms. The procedure uses the measured ambient vibration responses and the corresponding readable natural frequencies and mode shapes of the structural systems. Since offshore platforms are composed of heavy topsides supported by jacket structures, participation of the first mode is dominant in each direction in the response of the structure under field excitations. Moreover, ambient vibrations such as wave loads and boat impacts only excite the first modes of the structure. Therefore, it is difficult to find higher modes and the pertinent frequencies by use of accelerometers data. The introduced...
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